package android.ly;

import java.util.ArrayList;
import java.util.List;

import android.app.Activity;
import android.content.Intent;
import android.content.pm.PackageManager;
import android.content.pm.ResolveInfo;
import android.os.Bundle;
import android.speech.RecognizerIntent;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;

public class SpeakActivity extends Activity implements OnClickListener {

	private static final int VOICE_RECOGNITION_REQUEST_CODE = 1234;

	private ListView mList;

	/**
	 * Called with the activity is first created.
	 */
	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);

		// Inflate our UI from its XML layout description.
		setContentView(R.layout.speak);

		// Get display items for later interaction
		Button speakButton = (Button) findViewById(R.id.btn_speak);

		mList = (ListView) findViewById(R.id.list);

		// Check to see if a recognition activity is present
		PackageManager pm = getPackageManager();
		List<ResolveInfo> activities = pm.queryIntentActivities(new Intent(
				RecognizerIntent.ACTION_RECOGNIZE_SPEECH), 0);
		if (activities.size() != 0) {
			speakButton.setOnClickListener(this);
		} else {
			speakButton.setEnabled(false);
			speakButton.setText("Recognizer not present");
		}
	}

	/**
	 * Handle the click on the start recognition button.
	 */
	public void onClick(View v) {
		if (v.getId() == R.id.btn_speak) {
			startVoiceRecognitionActivity();
		}
	}

	/**
	 * Fire an intent to start the speech recognition activity.
	 */
	private void startVoiceRecognitionActivity() {
		Intent intent = new Intent(RecognizerIntent.ACTION_RECOGNIZE_SPEECH);
		intent.putExtra(RecognizerIntent.EXTRA_LANGUAGE_MODEL,
				RecognizerIntent.LANGUAGE_MODEL_FREE_FORM);
		intent.putExtra(RecognizerIntent.EXTRA_PROMPT,
				"Speech recognition demo");
		startActivityForResult(intent, VOICE_RECOGNITION_REQUEST_CODE);
	}

	/**
	 * Handle the results from the recognition activity.
	 */
	@Override
	protected void onActivityResult(int requestCode, int resultCode, Intent data) {
		if (requestCode == VOICE_RECOGNITION_REQUEST_CODE
				&& resultCode == RESULT_OK) {
			// Fill the list view with the strings the recognizer thought it
			// could have heard
			ArrayList<String> matches = data
					.getStringArrayListExtra(RecognizerIntent.EXTRA_RESULTS);
			mList.setAdapter(new ArrayAdapter<String>(this,
					android.R.layout.simple_list_item_1, matches));
		}

		super.onActivityResult(requestCode, resultCode, data);
	}
}
